If I put a serial number, place of manufacture, and a model #; would this not imply manufacture with intent to sell? I am thinking that leaving the receiver blank would indicate intent for personal use only.

or, it could imply that you would wish to have some sort of identification on the firearm in case it was stolen.

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That or something like "Manufactured under Gun Control Act (GCA) of 1968, 18 U.S.C. Chapter 44 for personal use only" etched on receiver. Should/would this pass LEO scrutiny in an eCheck situation